…caused by the activities of the people who live on Venus?

Caused by illogical non-sequiturs?

Perhaps you are unaware of this, but we are able to create artificial versions of natural phenomena. Islands, for instance, have existed as geographical features on Earth since long before humans were around. Yet, lo and behold:

Artificial islands!

As it happens, we can create artificial global warming as well. While the global warming on Venus happened without any human intervention, it doesn’t mean we can’t duplicate those results here on Earth. We’re giving it our all, and it looks like we’ll be successful.